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Fair Value - Other Fair Value Disclosures (Details) - USD ($)
6 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Mar. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, net of current maturities $ 8,046,000,000   $ 8,672,000,000
Tangible asset impairment charges 0 $ 0  
Impairment of intangible assets 0 0  
Impairment of other intangible assets 0 $ 0  
Fair value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, net of current maturities 8,000,000,000.0   8,200,000,000
Carrying value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, net of current maturities $ 7,800,000,000   $ 8,400,000,000